Back-tool holder



Aug. 5 1924.

G. GRONNER BMK TOOL HOLDER Filed July 26 lsz l?? U wh? GewyeGm/rmer y, v

Patented Aug. 5, 1924.

UNITED STATES PATENT OFFICE.

GEORGE GRONNER, Oll DAVENPORT, IOVJA.

BACK-TOOL IFIOLCDEE?!v Application filed July 2G, 1922. Serial No. 577,757.

(FILED UNDER THE ACT I? MARCH'. 3, 1883, STAT, L., 625,)

To all cfa/icm it muy concern' Fig. 2 is an end elevation.

Be it known 'that I, GEORGE ii/scimmia., a Referring' to the drawing by numerals ot citizen of the United States, and a resident reference: oi' Davenport, county of Scott, and State rllhe bed ot a lathe is indicated at l upon 45 5 of Iowa, have invented an improvement in which is mounted a carriage 2 to slide longi- Back-Tool Holders, of Which the following tudinally thereof, the carriage formed with is a specification. an extension 8 having a dove tail portion il. The invention described herein may be Mounted on the extension 3 is a tool used by the Government, or any oit its oiiiholder formed with a dove-tail groove 6 50 l0 eers or employees in prosecution oi: Work to receive the dove-tail portion it, Which for the Government, or by any other person holder is adjustable longitudinally o'l the in the United States, Without payment to me extension and clamped in adjusted position of any royalty thereon, in accordance with in any suitable manner, as by set screws '7. the act ot' March 3, 1883. llounted on the holder is a rest 8 upon 55 In lathe Work it is often desirable, in which a slide 9 is carried to travel longiorder that a piece ot Work may be nished tudinally thereof, being adjusted to desired more expeditiously, that a back tool be einpositions by the soreT 10. The slide is ployed so as to double the depth. ot' cut for grooved to receive the foot ot post ll in each revolution of the Work. which a tool l2 may be clamped, as by 60 rflue present invention has been devised ineans oit screw lf3. The tool l2 is provided to provide a holder 'tor such a tool ivhiffh to operate upon the Work 14tivhich is also may be readily adjusted to bring` the tool to operated upon by a tool carriedI in the usual proper position and Which may be easily recarrier indicated generally at l5. moved When such tool is not desired on. the l claim: 25 Work.V l. The combination with a carriage l/Vitli these and other objects in view, my formed with a dove tail rear extension, said invention resides in the novel arrangement extension being in the plane ot the carriage, and combination oi parts and in the details ot a tool holder having a dove tail groove ot construction hereinatter described and to receive said extension, a slide adjustable 30 claimed, it being understood that changes in on said holder, a post secured on said slide the precise embodiment of the invention and means carried by the post for clamping herein disclosed may ie made Wit-hin the a tool in place thereon, scope otl What is claimed Without dejiarting 2. The combination With a carriage from the spirit oilf the invention. vtermed with a rear extension, said extension 35 A practical embodiment of the invention being in the plane ot the carriage, of a tool is illustrated in the accompanying drawing` holder mounted on said extension and ad- Wherein justable longitudinally thereof and means Fig'. l is a side elevation of a holder contor clamping the holder in adjusted structed in accordance With my invention, position. shown applied to a lathe, a portion ot which is shown, parts being in section; GEORGE (l-RUNNER. 

